Why this rectangle is not drawn?

Question

public class Greeter extends MovieClip
{

    public function Greeter()
    {
        addEventListener(Event.ADDED_TO_STAGE, go);
    }

    private function go(evt:Event):void
    {
        removeEventListener(Event.ADDED_TO_STAGE, go);
        var _root:MovieClip = parent.parent as MovieClip;

        var sp:Sprite = new Sprite();

        // Desenhando com um objeto graphics
        var g:Graphics = sp.graphics;
        g.beginFill(0xFF0000, 1);
        g.drawRect(10, 10, 300, 200);
        g.endFill();

        _root.addChild(sp);
    }
}

mxml file:

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="1024" minHeight="768"
               creationComplete="initApp()">

        <fx:Script>
            <![CDATA[
                public function initApp():void
                {
                    var greeter:Greeter = new Greeter();
                }
            ]]>
        </fx:Script>

</s:Application>

--answer:

Add to the stage using addElement and extends spark.core.SpriteVisualElement.

Answer 1

You need to add greeter to the stage

public function initApp():void
{
    var greeter = new Greeter();
    addChild( greeter );
}

When calling addChild( greeter ) it will trigger the event listener you added in the Greeter constructor and call the go method in which you draw your rectangle. Note that you don't need to do: _root.addChild( sp ); Since greeter is added to the stage in the initApp method, you can just add sp to greeter, by doing addChild( sp ) in the go method.